Goal:By measuring:
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Parts of the LabIntroduction: Homeostasis means maintaining a relatively constant state of the body’s internal environment. The term used to describe a pattern of response to restore the body to normal stable level is termed negative feedback. When a stimulus (environment change) is met by a response that reverses (negates) the trend of the stimulus, it is negative feedback. As a result the internal environment is returned to normal. Pulse rate is constantly checked by receptors throughout your body. A stimulus such as elevated pulse rate leads to a reaction by an organ making the response. An appropriate response will return the pulse rate to normal.
Purpose: To observe an example of homeostasis working to control your body’s pulse rate.
Procedure:
Graph:
Graph the results of these trials in your lab report. Plot the resulting measurements from Trials 1-7. · Connect the line |
Important to ReviewCOMPONENTS OF A NEGATIVE FEEDBACK LOOP
1. RECEPTOR -Sensor that monitors the internal environment (ex. Nerve fibers of the heart detect the heart rate)
2. CONTROL CENTER(set point)-is what a particular value should be and is controlled by the brain.(ex. Brain-controls the heart rate) 3. EFFECTOR-causes responses that alter conditions in internal environment, muscles or glands (ex. Adrenalin is released by adrenal gland to speed up the heart when more oxygen is needed for cells) 4. STIMULUS- change that occurs in the internal environment ( ex. Not enough oxygen getting to cells) 5. RESPONSE-how the change is corrected (ex. Heart rate increases) REGULATION 0F HEART RATE REVIEWLINK TO CLASS NOTES ON LAB QUESTIONS (PDF) |
Conclusion:
Restate the purpose of this experiment, your findings and how your data supports your conclusion. Was your hypothesis confirmed by the experiment? Discuss. What connections do you see between body systems during this? Explain. - Link to HOW TO WRITE A LAB REPORT |